Attachment for metal-punching machines



.No. 627,033. Patented lune l3, I899.

L. WILLIAMS.

ATTACHMENT FOR METAL PUNCHING MACHINES.

(Application filed Max. 17, 1899.)

(No Model.)

WI TNESSES INVENTOR Attorney f sagomugimns co. PHOTO-LITNQ, wnsnmomu. a.c.

machine A thereis a bracket 1.

LEWVIS WVILLIAMS, OF JOHNSTOWN, PENNSYLVANIA.-

ATTACHMENT FOR METAL-PUNCHING MACHINES.

SPECIFICATION forming part of Letters Patent no. 627,033, dated June 13,1899.

Application filed March 17,1899.

To all whom it may concern:

Be it known that I, LEWIS lVILLIAMs, a citizen of the United States,residing at Johnstown, in the county of Oambria and State ofPennsylvania, have invented certain new and useful Improvements inAttachments for Metal-Punching Machines, of which the following is aspecification, reference being had therein to the accompanying drawings.

This invention relates to machines for punching metals.

The object of the invention is to produce an attachment for connectionto a punchingmachine, punching-press, or like machine, which attachmentsupports the punching-tool and permits the movement of such tool todifferent positions under the press or plunger, whereby a plate or otherobject to be punched may have a number of holes punched therein, ifdesirable, without necessity for the movement of the plate itself-thatis, the tool is moved to the work instead of the Work moving to thetool, as is the usual practice.

Figure 1 is a plan or diagram indicating a punching press or machine ofany usual construction and indicating in full lines and dot ted linesthe positions which may be reached by the punch under the plunger. Fig.2 is a partial side elevation and partial section of the attachment,parts of the punching-machine being indicated in dotted lines. Fig. 3 isa sectional detail of a modified punch and feeler, the punch being intwo parts M M connected by a screw-threaded joint.

A indicates a punching machine or press of any usual construction andprovided with a vertically-reciprocating plunger B, which is undercontrol of the operator and is caused to move by a lever or treadleoperating a suitable motive power. The plunger B has a plane lower faceand does not directly carry. the punching-tool.

C denotes the machine bed or anvil, having aplane' face, as usual, andbeing parallel with the plane face of plunger B.

Connected to some part of the frame of the A yoke D is pivoted to thebracket 1 by a pintle 2 or otherwise. This yoke, as shown, has integraltop and bottom bars and connecting-standards, such being a convenient,but not an es- Serial No. 709,486. (No model.)

sential, construction. The joint between the yoke and bracket may haveantifriction-balls 3 to insure an easy movement about the pivot 2.

To the outer or swinging end of yoke D a second yoke D is pivoted by apintle 5 or other suitable connection. This yoke D, as shown, has topand bottom bars or arms connected by an integral vertical standard, andthe joint between the two yokes may be a ball-joint 6. WVhen thusconstructed and connected, the yoke D may swing in a plane about pintle2 and the yoke D may swing in the same plane about pintle 6 whilepartaking of the movement of the first yoke. The outer end of yoke Dtherefore has a wide range of movement in a plane parallel with the faceof the plunger 13 and the anvil O and may be moved to anypositionbetween the plunger and the anvil. The upper and lower arms of yoke Dare preferably in line at their outer ends, so that the punch and diewill be in alinement with each other.

The lower arm or bar of yoke D carries a seat 8, having a passage 7therein and a recess for the reception of the die F, correspond ing tothe punch to be used. The die F is held in its seat by set-screw 9 or byother suitable means and can be changed on occasion. The disks cut fromthe work by the punch escape through passage 7 I The upper arm of yoke Dhas a vertical recess to receive the punch-holder L, to which holder thepunch E is connected by a screwcollar J or in other suitable manner.

The holder L has a shoulder 10 near its upper end. A strongspiral springK surrounds the holder in recess in the yoke D and tends to I lift theholder and punch. The collar J limits this movement by its engagementwith the arm of the yoke.

The punch E has a transverse slot and a vertical perforation and may bein one or more parts. (See Fig. 3.) A sleeve P surrounds the body of thepunch, being held thereto by a pin 11 passing through the slot. Thissleeveis a hand-grasp for the operator, and by taking holdof this sleevethe punch may be swung anywhere within its limit of movement, and as thedie F on the lower arm of the yoke partakes of the movement the punch ase /goes and die are necessarily in alinement and the punch is inposition to be driven down by the plunger.

The vertical recess in the punch contains.

pushes its head up against the pin 11, thus lifting the sleeve or handleP.

A stripper or presser foot H is connected to the outer end of the yoke Dby bolts or:

otherwise.

The plate G or other article to be punched is supported on rolls 12 orother convenient supports, so that the body of the plate extends betweenthe bed or anvil O and the follower B. Preferably the rolls or supports12 will hold the plate so far above bed 0 that the die F may be easilyswungbetween the bed and plate, and the punch will then swing above theplate. The punch and die will preferably be relatively so adjusted thatthere is not much more than room for the work between the punch and die.

The plate G will be marked, preferably, by a prick-punch in the variousplaces which are to be punched by the machine, and when placed onsupports 12 the punch is swung under follower E. The operator, pressingdown on sleeve 1?, projects the feeler I until it enters one of thepricks in the plate. Then by his foot or other hand he throws plunger Binto operation. This plunger falls on holder L and drives down the punchthrough the plate, the disk or fillet dropping through the hole oropening 7. As soon as the downward pressure of the hand on sleeve P isreleased the feeler risesundr the impulse of spring M. As soon asplunger 13 rises the-spring K lifts the punch and its holder, thestripper I-I holding down the work.

Much of the work for which'this machine is specially useful is inpunching holes in boiler or similar plates. These'plates may besupported a little above the die and will'yield by their own elasticitywhen'the punch falls,

so as to be seated firmly on the die; but rolls or supports 12 might beelastically supported, if desirable.

Yoke D might be slightly elastic, so as to support the die-seat farenough above the bed Cfto permit easy movement. The action of theplunger B will seat all the parts firmly when the plunger falls.

shifted from point to point between plunger B and bed 0, there isconsiderable advantage in economy and accuracy of work over the usualmethod of shifting the plate to the punch,-which reciprocates alwaysinthe same line.

Asa punch supported in this manner can be very quickly Modificationswithin the scope of my claims are contemplated.

What I claim isv 1. An attachment for a punching-machine provided withfiat anvil and reciprocating flat-faced plunger, said attachment consisting of a yoke pivoted to swing in the plane of the anvil and plunger andhaving parallel arms, a recessed die carried by one arm of the yoke anda punch carried by the other arm of the yoke, and a handle by which theyoke may be swung so as to carry the punch and die to the work betweenthe plunger and anvil, substantially as described.

2. In anattachment for punching=machines, a swinging yoke pivoted to theframe of the machine, a second twoarmed yoke pivoted to the outer end ofthe first and swinging in the plane of the machine plunger and bed, adie carried by one arm of the second yoke, and a punch and lifting-spring carried by the other arm in line with the die, all combinedsubstantially as described.

3. In an attachment for punchingmachines, a swinging two-armed yoke, adie carried by one arm of the yoke, and a punch carried by the other armand having means for lifting thepunch, and a hand-grasp consisting of asleeve surrounding the punch-body, allcombi-ned substantially asdescribed.

t. In an attachment for punching machines, a swinging yoke carrying apunch, the body of the punch slotted transversely andperforatedlongitudinally, a pointer-feelerin the perforation of thepunch, and a sleeve surrounding the punch and operating on the feeler byaconnection through the slot in the punch-body, substantially asdescribed.

5. Inan attachment for punching-machines, the punch having a centralpassage with a spring-lifted feelertherein, and a handle surrounding thepunch and connected to the feeler so that the-same may be depressed bythe action of the handle,substantiallyas de- -chine,-and on the otherarm a punch which maintains its alinemeut with the die but swings abovethe work under the machineplunger, and a handle bywhich the yoke may beswung, all substantially as described.

In testimony whereof I affixmy signature in presence of two Witnesses.

LEWIS WILLIAMS.

Witnesses:

H. W. STOREY, COLLINS M. SWAN.

